ad 3208 question!

[mgmusic]

Hi !

I just put together a AD3208 with 4x BL3208 instead of 02x MN3205 since they are now almost impossible to get.

The question is :

I only added the 02 extra BLs to the board nothing more and the result was same MN3205 sound but with a distortion in the end.
I tried everything with the BIAS and Balance trim pots
and the distortion won't go away.

do you think should I add an extra MN3102 too? or 01 is enough?

any good tip?


thanks!!!!!!!!!!!!!!!!!

[redeffect]

I'm sorry if this answer is slightly off topic, BUT... You should check out Small Bear for all your BBD needs. He has plenty of MN3205 chips, as well as LOADS of other cool stuff. Give it a look.
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[mgmusic]

I'm sorry if this answer is slightly off topic, BUT... You should check out Small Bear for all your BBD needs. He has plenty of MN3205 chips, as well as LOADS of other cool stuff. Give it a look.
red

Yes , I'm steve´s client for years.
but the mn's are almost sold out.

but I need to try the 4x BL's for my project

thanks anyways!

[jxoco]

bl3208's have two outputs, are you connecting both outputs together thru 2K4 resistors or a 5k trimpot with the output from the wiper?

[redeffect]

Are you calibrating with a 'scope ; or by ear? Also, maybe try multi-turn trimpots for the bias & balance. More fine control over the process.

red

[george]

but the mn's are almost sold out.

?!? check out http://www.smallbearelec.com/Categories.bok?category=ICs+Delays+and+Echo&searchpath=421d832e10a90a2e03e272a&start=17&total=24

don't look sold out to me ....

[TELEFUNKON]

looks like it`s for multiple commercial builds. so supply must be steady.

Check out M.`s gorgeous site:

absolute funktasticly psychodelic!!!

[mgmusic]

looks like it`s for multiple commercial builds. so supply must be steady.

Check out M.`s gorgeous site:

absolute funktasticly psychodelic!!!

hey Telefunkon!
that's it!
that's for the echo folks delay!



RED EFFECT

BY ear!

i will try mult turn trimpots.
thanks!

[mgmusic]

bl3208's have two outputs, are you connecting both outputs together thru 2K4 resistors or a 5k trimpot with the output from the wiper?

5k trimpots!

[mgmusic]

Are you calibrating with a 'scope ; or by ear? Also, maybe try multi-turn trimpots for the bias & balance. More fine control over the process.

red

can you help me to calibrate with a scope?
is it hard?

thanks again!

[TELEFUNKON]

mg: have you showed your pedals yet in the Pictures thread?

[mgmusic]

mg: have you showed your pedals yet in the Pictures thread?

not yet!

I didn't know about that.

thanks sir!

[redeffect]

GGG has all the scope calibrating info right there in the ad3208 description. In the case of your build, the process has to be repeated 4 times;increasing the margin of error. I guess thats why a scope is preferable. The fact that the unit works means youre almost there; so keep them knobs turning!
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